Air or gas compressor



R. vENDME AIR 0R GAS COMPRESSOR Filed Aug. 21. 19:55

Oct.' 26, 1937.

Patented Oct. 26, 1937 UNi'i'ED STATES new.

AIR R GAS COMPRESSOR Raoul Vendme, Paris, France, assignor to Marcel Franck, Paris, France Application August 21, 1935, serial No. 37,150 In France SeptemberZ, 1934 1 Claim.

This invention relates to improvements in air or gas compressors and more especially in air compressors designed to be applied to spraying apparatus for atomizing liquids.

5 It concerns particularly compressors of the kind in which a piston is driven by means of pressure acting upon it in the body of a pump and returned to its rst position when set free, through the action of a spring; it is more especially characterized in that the return stroke of the piston is limited by abutment means placed inside the pump body. When once the piston has beenset in position it is not necessary to x a stop ring or the like upon the open end of the pump body or cylinder, the assembling and the taking to pieces of the piston are thus simplied and the outer shape of the apparatus is remarkably neat and smooth.

According to one mode of execution of the invention, the piston is mounted upon the outer end of a piston rod made in one or several parts slidable in each other, the part farthest from the piston being secured at its end to the bottom of the cylinder. Vhen the piston rod is fully exexactly level with the cylinder edge.

The piston rod is preferably hollowV and opened to theoutside and it passes through a hole provided in the piston, its inner end communicating through a suitable orifice with the interior of the cylinder. The pressure air or gas hows out through an orifice provided near the bottom oi the cylinder. Y

In order that the invention may be fully appreciated the same will now be described with reference to the accompanying drawing which illustrates by way of example one practical form of execution of my invention.

Fig. 1 is an laxial sectional View drawn on a larger scale along the line -I of Fig. 2 of a compressor constructed according to the present invention.

Fig. 2 is an elevation, drawn on a smaller scale of a spraying apparatus provided with a compressor of the present system.

Fig. 3 is a similar view illustrating another way of xing the compressor to the spraying apparatus.

The compressor is shown as comprising a cylinder I in which a circular shaped piston 2 is slidably mounted. Said piston is centrally bored and mounted upon a small sleeve 4. It is provided with a disk 1 of leather or other exible material which is secured by means of a washer 8, the Whole being clamped against the inner face of tended in the manner of a telescope the piston is (Cl. 23o- 190) 'an outer screwthread provided on the outer'surface of the sleeve 4. VThe latter constitutes the rst member of anY extensible rod' composed of the hollow members 4, 5, which may slide inv each other and whose extension is limited by flanges 4a, 5a, 5b, 6a. which abut against oneranother when the members 4, 5, 6 are fully extended, the outer surface of the piston coming in that position exactly on a level with the edge of the cylinder I. The end of the hollow member 6 farthest away from the piston is xed, preferably by screwing in the bottom I of cylinder i, and is provided with a small orifice Ill which puts the interior of the hollow members d, 5, I5 in communication with the cylinder chamber I; A spring II tends to force the piston I towards the exterior. The cylinder is provided With a delivery opening I2 preferably located laterally near the bottom I of the cylinder which is connected for example with a spraying nozzle I3,..-

The mode of operation of the above described compressor is as follows:

The pistonV 2 is pushed into the cylinder I by obturating with the nger theopening I4 oifthe member 4. The members 4, 5 andi slide one upon the other and the air in the cylinder I is driven through the opening I2 towards the place where it is to be used in the direction of the spraying nozzle I3 for example. On the piston being then set free it is returned by the spring IIV in its outer position in which it is retained through the abutment of the ilanges 4m, 5a, 5U, Ba, of the members 4, 5, 6 against each other. return stroke, the orifice I4 being uncovered, the outer air lls the cylinder as it flows inside the members 4, 5, 6 and through the orice I0.,Y

Fig. 2 shows the compressor mounted upon the head of a spraying apparatus, the cylinder being preferably welded directly upon said spraying apparatus. v

The compressor may also be connected to the spraying apparatus in any other suitable man- During this ner, by means of a metal tube It for example, as Y closing one end thereof, a delivery opening being formed in said body adjacent said bottom to connect said body with a spraying apparatus, a piston movable in said body, a spring situated inside said body and actuating said piston towards the open end of the body, a hollow rod secured at one end to the bottom of the body and constituted by telescoping members, the piston being secured to the other end Aof said rod, said rod'being open to the outside atmosphere and communicating with the interior of the body through an orice formed in the rod adjacent its first-mentioned end, and abutments upon the hollow telescoping rod members for the purpose of limiting the piston stroke so that the latter comes to a level with the edge of the body When the hollow rod is fully extended. A Y

RAOUL VENDOME. 

